From: Xiaoguang Wang lege.wang@jaguarmicro.com Sent: Friday, November 1, 2024 2:05 PM

Allocate one extra virtio_device_id as null terminator, otherwise vdpa_mgmtdev_get_classes() may iterate multiple times and visit undefined memory.

Fixes: ffbda8e9df10 ("vdpa/vp_vdpa : add vdpa tool support in vp_vdpa") Cc: stable@vger.kernel.org Suggested-by: Parav Pandit parav@nvidia.com Signed-off-by: Angus Chen angus.chen@jaguarmicro.com Signed-off-by: Xiaoguang Wang lege.wang@jaguarmicro.com

---

V2: Use kcalloc() api.

---

drivers/vdpa/virtio_pci/vp_vdpa.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/vdpa/virtio_pci/vp_vdpa.c b/drivers/vdpa/virtio_pci/vp_vdpa.c index ac4ab22f7d8b..b6410a984f29 100644 --- a/drivers/vdpa/virtio_pci/vp_vdpa.c +++ b/drivers/vdpa/virtio_pci/vp_vdpa.c @@ -612,7 +612,11 @@ static int vp_vdpa_probe(struct pci_dev *pdev, const struct pci_device_id *id) goto mdev_err; }

• mdev_id = kzalloc(sizeof(struct virtio_device_id), GFP_KERNEL);

• /*

• * id_table should be a null terminated array, so allocate one
  

additional

• * entry here, see vdpa_mgmtdev_get_classes().
  

• */
  

• mdev_id = kcalloc(2, sizeof(struct virtio_device_id), GFP_KERNEL); if (!mdev_id) { err = -ENOMEM; goto mdev_id_err;

Now that mdev_id is an array, please change the id assignment as below. Even though existing code works is confusing to read it without an array.

- mdev_id->device = mdev->id.device; - mdev_id->vendor = mdev->id.vendor;

+ mdev_id[0].device = mdev->id.device; + mdev_id[0].vendor = mdev->id.vendor;

-- 2.40.1